Plumbing, Heating and Air Conditioning Service in Dover
When Dover homeowners need fast, reliable help with cooling, heating and plumbing systems, they turn to skilled professionals, like GSMS, who understand the local climate and housing infrastructure. We provide full-service HVAC and plumber solutions with same-day availability, emergency repairs, and trusted workmanship.
Call 603-424-8258 when you need HVAC or plumbing service in Dover, NH or contact us online with any questions.
Heating Services Tailored for New Hampshire Winters
Keeping homes warm during brutal New England winters demands efficient, responsive heating systems. We specialize in the installation, maintenance, and repair of:
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Furnaces (gas and electric)
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Boilers
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Heat pumps
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Ductless mini-splits
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Radiant floor heating
Our licensed technicians perform full heating system diagnostics to pinpoint inefficiencies. Whether it’s a faulty igniter, uneven heating, or poor airflow, we solve the root issue—not just the symptom. We also offer high-efficiency system upgrades designed to lower energy bills and qualify for local utility rebates.
AC Repair and Installation That Keeps You Comfortable Year-Round
New Hampshire summers are short but humid. That’s why we offer responsive AC repair and installation that keeps homes cool and dry when it counts most.
Common AC issues we resolve:
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AC blowing warm air
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Thermostat not responding
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Frozen coils
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Unusual sounds or smells
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Uneven cooling
We work on all major brands, including Carrier, Trane, Lennox, Goodman, and Mitsubishi. For older systems, we offer replacement units with SEER2-compliant ratings to ensure energy efficiency and eligibility for Energy Star tax incentives.
Dover Area Plumbers – Fast, Friendly, and Thorough
A burst pipe, flooded basement, or broken water heater can’t wait. Our team is ready to handle plumbing emergencies in Dover day or night. We dispatch local professionals who are familiar with old and modern plumbing infrastructures.
Emergency plumbing services include:
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Pipe leak detection and repair
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Emergency drain clearing
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Water heater troubleshooting
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Main line repairs
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Sump pump failure
We also use trenchless technology when possible to minimize disruption during pipe repairs and replacements.
Water Heater Services – Reliable Hot Water On Demand
We install and service both traditional tank-style and tankless water heaters. From pilot light issues to full system replacements, we ensure your home never runs cold.
Signs it’s time to call us:
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No hot water
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Water heater leaking
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Strange sounds or smells
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Water takes too long to heat
We install high-efficiency models from AO Smith, Rheem, Bradford White, and Navien, helping you cut energy usage and enjoy consistent hot water.
Drain and Sewer Solutions – Clear Pipes, Healthy Homes
A clogged drain or sewer backup is more than an inconvenience—it’s a health hazard. We provide comprehensive drain cleaning and sewer line inspections using advanced tools like:
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Video camera inspections
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Hydro-jetting
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Snaking and auger tools
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Sewer line tracing and mapping
We’re experienced with Dover’s older sewer systems and provide honest recommendations on whether repair or replacement is the most cost-effective option.
Get the Best HVAC & Plumbing Service in Dover, NH
We’re proud to serve Dover with trustworthy home air conditioning, heating and plumber services backed by expertise, honest communication, and lasting results. Contact us online or call 603-424-8258 today to schedule service or request emergency repair—your comfort and safety are our top priority.
Same-day service available. Call or book online 24/7.
Recent Jobs and Reviews in Dover, NH
Our Local Reviews by City
- Amherst, NH (3)
- Atkinson, NH (1)
- Auburn, NH (1)
- Barrington, NH (12)
- Bedford, NH (14)
- Candia, NH (2)
- Chester, NH (1)
- Concord, NH (5)
- Derry, NH (2)
- Dover, NH (1)
- Epping, NH (1)
- Gilmanton, NH (1)
- Goffstown, NH (3)
- Henniker, NH (2)
- Hillsborough, NH (1)
- Hollis, NH (7)
- Hooksett, NH (5)
- Hudson, NH (4)
- Lee, NH (1)
- Londonderry, NH (10)
- Manchester, NH (33)
- Merrimack, NH (14)
- Milford, NH (3)
- Moultonborough, NH (1)
- Nashua, NH (19)
- New Boston, NH (3)
- Northfield, NH (1)
- Northwood, NH (1)
- Pembroke, NH (1)
- Raymond, NH (1)
- Rochester, NH (2)
- Salem, NH (3)
- Sandown, NH (1)
- Stratham, NH (1)
- Weare, NH (4)
- Windham, NH (6)
Job Locations and Reviews
Mark and Jack did an excellent job cleaning out the very dirty air ducts in an old air exchanger (installed by someone else, back in 1993, and had never been cleaned out). They showed up on time, and worked steadily until finished. I should have had this done a long time ago.
Clean both HRV outside ducts (exhaust and fresh air), clean indoor return and supply main duct. Clean take off ducts from supply and return. Remove all grills and clean them.
Tune up Lennox oil furnace
Riello burner was locked out. We found it to be a bad flame sensor. We replaced it with a new one. We also replaced the air vent, expansion tank, and the pressure/ temperature gauge. Thank you!
Started off with washing the outdoor coil with water. Cleaned the indoor coil with soap and water. I washed the air filter with soap and water. All electrical connections look good. The operating pressures were perfect. We cleaned out the inside of the boiler with the Soot vac. Replaced the oil filter on the tank, the pump strainer on the burner, the oil nozzle on the burner, and the electrodes on the burner. The tridicator on the boiler needs to be replaced. The bottom of the shower was leaking water so we cleaned the drain and then caulked it. If it continues to leak the shower drain should be cut out and replaced.
